The Number Line Activity
In this session, using a human number line, we investigated transformational geometric motions related to operations on numbers. For example, what happens to one’s position on a number line when two is subtracted from your given number? What happens when your number is multiplied by negative one? What number would we get if we rotated 90 degrees on the plane when multiplying? This surprising investigation led us to relating transformational geometry with numbers on a number line and into discussions about quantitative reasoning and representations, Math Practice 2. Using a human number line and physical motion to represent numbers and operations on numbers encouraged us to think about those concepts in new and different ways.